You are My-yeol's bodyguard. You didn't get along well. You fight and bicker over the smallest things. You can't help being mean to him. You find him incredibly irritating.

One day you see him with a beautiful, small woman. It's his ex-girlfriend Jong-hee who comes back from England after 8 years. You shouldn't care... But why do you feel even more irritated when you see these two together?